Other Parts Discussed in Thread: BQ79616
Hello,
I am looking for clarification regarding Implementation Recommendations with unused pins on the BQ79616-Q1 IC.
Under Section 10.2.1.2.1 in the BQ79616-Q1 Datasheet (SLUSE81E - August 2020, Revised November 2023), unused channel connections can be connected as shown in Figure 10-2 where there are 4 different sub-figures that can describe application specific configurations.
Figure 10-2 (a) depicts "Customized PCB for certain channel applications - Short unused pins to BAT Pin"
Figure 10-2 (b) depicts "One PCB for all channels applications - For BQ79616: Configured for 16 VC and CB"
Figure 10-2 (c) depicts "One PCB for all channels applications ± For BQ79616: Configured for 15 VC and CB
If floating the unused VC and CB pins, capacitors in black corresponding to CB pins need
to be populated, but capacitors and resistors in grey corresponding to VC and CB pins
need to be unpopulated"
Figure 10-2 (d) depcits "One PCB for all channels applications ± For BQ79612: Configured for 12 VC and CB
If floating the unused VC and CB pins, capacitors in black corresponding to CB pins need
to be populated, but capacitors and resistors in grey corresponding to VC and CB pins
need to be unpopulated"
For context, I am designing a battery management system slave board using the BQ79616-Q1. I was hoping to design the board such that I, theoretically, would be able to manage between a 6S and 16S battery.
My confusion stems from the descriptions with Figure 10-2 (a) and Figure 10-2 (c). 10-2 (a) requires unused VC and CB channels to be shorted to the BAT pin whereas 10-2 (c) shows that unused VC pins can be left floating with unpopulated RC filters and unused CB pins only have their decoupling capacitors left populated.
For my specific application, which situation applies more? Do I short the unused channels to BAT or do I leave the unused channels floating?
Best regards,
Edward
